<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        body {
            margin: 0px;
            padding: 0px;
        }
        .main {
            width: 100%;
            height: 100px;
            line-height: 100px;
            background: linear-gradient(to bottom, , #21c3c6);
            font-family: "Microsoft YaHei UI";
            font-size: 48px;
            color: white;
        }
        .title {
            margin-left: 30px;
        }
    </style>
</head>
<body>
    <div class="main">
        <span class="title">测试标题</span>
    </div>
</body>
</html>